inserting to mysql column values form the html drop down list

I have a very little knowledge in php mysql. I want to make a periodical report of my company's strength of various departments. I have a html page like
<!DOCTYPE html> <html> <head></head> <body> <form action="" method="post">
Department : <select name="dept"><option>admin</option><option>finance</option><option>motor dept</option><option>logistics</option></select>
Designations:<select name="design"><option>clerks</option><option>executives</option><option>helpers</option><option>drivers</option></select>
No. of employees:<input type="text" name="persons" size=3"/> <input type="submit" name="submit"/></form>